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* Centre National de la Recherche Scientifique, Institute Transgenose, Orleans, France;
Key-Obs S. A., Orleans, France;
Evolutec, Ltd., Oxford, United Kingdom;
Centre for Ecology and Hydrology, Oxford, United Kingdom;
¶ Deptartment of Pharmacology, Instituto de Ciências Biomédicas, University of S. Paulo, Brazil; and
|| Institute for Biopharmaceutical Research, Matzingen, Switzerland
Because histamine receptor type I blockade attenuates allergic asthma, we asked whether complete neutralization of histamine by an arthropod-derived, high affinity histamine-binding protein (EV131) would prevent allergic asthma. Intranasal administration of EV131 given before Ag challenge in immunized mice prevented airway hyperreactivity by 70%, and abrogated peribronchial inflammation, pulmonary eosinophilia, mucus hypersecretion, and IL-4 and IL-5 secretion. Saturation with histamine abrogated the inhibitory effect of EV131 on bronchial hyperreactivity. The inhibitory effect of EV131 on bronchial hyperreactivity was comparable to that of glucocorticosteroids. These results demonstrate that histamine is a critical mediator of allergic asthma. Therefore, complete neutralization of histamine, rather than specific histamine receptor blockade, may have a profound effect on allergic asthma.
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